抄録
CCS technology is expected to reduce CO_2 emission, but its net efficiency is supposed 29 to 33% (HHV) because capture unit requires large m-house power. Proposed "oxy-fuel IGCC system" can keep high thermal efficiency more than 40% even after capturing CO_2. This system gasifies coal with mixed gas of recycled CO_2 flue gas and necessary amount of O_2, just as oxy-fuel combustion. Therefore, CO_2 concentration in exhaust gas is so high that CO_2 capture unit is not required. Moreover, CO_2 gas accelerates coal gasification reaction as gasifying agent CRIEPI and Kyusyu university are running various programs to develop fundamental technologies for this system. This paper is to report the newest findings by CRIEPI. It was concerned with difficulties to design large-scale regenerative heat exchanger, one of key components of this system. But finally we succeeded to design compact large-scale regenerative heat exchanger.
